1 <%@ page language="java" contentType="text/html; charset=UTF-8" 2 pageEncoding="UTF-8"%> 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 4 <html> 5 <head> 6 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 7 <title>Insert title here</title> 8 </head> 9 <body> 10 <form action="disp.jsp"> <!-- 相当于使用get --> 11 <input type="text" name="info"> 12 <input type="submit" value="submit"> 13 </form> 14 </body> 15 </html>
display.jsp
1 <%@ page language="java" contentType="text/html; charset=UTF-8" 2 pageEncoding="UTF-8"%> 3 <%@ taglib prefix="c" uri="http://www.mldn.cn/jst/core" %> 4 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 5 <html> 6 <head> 7 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 8 <title>Insert title here</title> 9 </head> 10 <body> 11 <%=request.getParameter("info") %> 12 </body> 13 </html>
我使用了filter，代码如下：
1 package org.lxh.filterdemo; 2 3 import java.io.IOException; 4 import java.nio.charset.Charset; 5 6 import javax.servlet.Filter; 7 import javax.servlet.FilterChain; 8 import javax.servlet.FilterConfig; 9 import javax.servlet.ServletException; 10 import javax.servlet.ServletRequest; 11 import javax.servlet.ServletResponse; 12 import javax.servlet.http.HttpServletRequest; 13 import javax.servlet.http.HttpServletResponse; 14 15 public class CharacterEncodingFilter implements Filter { 16 protected String encoding = null; 17 protected FilterConfig filterConfig = null; 18 protected boolean enable = false; 19 public void destroy() { 20 this.encoding = null; 21 this.filterConfig = null; 22 } 23 public void doFilter(ServletRequest request, ServletResponse response, 24 FilterChain chain) throws IOException, ServletException { 25 if (this.enable) { 26 String encoding = this.selectEncoding(request); 27 if (encoding != null && !encoding.equals("")) { 28 System.out.println("~~" + this + ": request :" + encoding); 29 request.setCharacterEncoding(encoding); //Overrides the name of the character encoding used in the body of this request. This method must be called prior to reading request parameters or reading input using getReader(). 30 // response.setCharacterEncoding(encoding); // 暂时不太清楚 31 } 32 } 33 // Pass control on to the next filter 34 chain.doFilter(request, response); 35 if (this.enable) { 36 String encoding = this.selectEncoding(request); 37 if (encoding != null && !encoding.equals("")) { 38 System.out.println("~~" + this + ": response :" + encoding); 39 response.setCharacterEncoding(encoding); 40 } 41 } 42 } 43 public void init(FilterConfig filterConfig) throws ServletException { 44 this.filterConfig = filterConfig; 45 this.encoding = filterConfig.getInitParameter("encoding"); 46 if (!Charset.isSupported(encoding)) { 47 encoding = null; 48 } 49 String enableString = filterConfig.getInitParameter("enable"); 50 if (enableString.equalsIgnoreCase("true")) { 51 this.enable = true; 52 } else { 53 this.enable = false; 54 } 55 } 56 protected String selectEncoding(ServletRequest request) { 57 return (this.encoding); 58 } 59 }
filter开启，但是仍然有乱码问题，把method="post"添加上就好了
主要的问题在于对get和post理解的不透彻：